Answer:
180 g Ca
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
4.4 mol Ca
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Step 3: Convert
[tex]4.4 \ mol \ Ca(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca} )[/tex] = 176.352 g Ca
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
176.352 g Ca ≈ 180 g Ca
What is the mass of 1.52 mol of the element
chlorine (Cl)?
Answer in units of g. HELP!!!!!!
Answer:
53.96g
Explanation:
Given parameters:
Number of moles = 1.52mole
Unknown:
Mass of the given mole = ?
Solution:
The given element is chlorine;
Mass of chlorine = number of moles x molar mass
Molar mass of chlorine = 35.5g/mol
So;
Mass of chlorine = 1.52 x 35.5 = 53.96g
if you react 28 grams of butene with excess hydrogen how many grams of butane would you expect to get
Answer:
The correct answer is 29 grams.
Explanation:
Based on the given question, the reaction will be,
CH3CH=CHCH3 + H2 ⇒ CH3CH2CH2CH3
The molecular weight of butene is 56 grams per mole, and the molecular weight of butane is 58 grams per mole.
Thus, it can be said that 56 grams of butene reacts with hydrogen gas and produces 58 grams of butane.
Therefore, 28 grams of butene when reacts with hydrogen gas to give,
= 58/56 * 28 = 29 grams of butane.
Hence, the mass of butane produced will be 29 grams.
Can someone help me with number 5:/
So to answer this question first let's decribe precision vs accuracy.
Precision in this case means exact and accurate; in this scenario all of the dots next to each other mean that it is highly precise.
Whereas Accuracy means aiming for the middle of the circle in this case. Thus the accuracy is low, but the precision is high.
TLDR: It is highly precise but not accurate.
Look up "Accuracy vs. Precision: What’s the Difference?" for a better detailed example and solution.
invenstigatory project potato battery research questions
Answer:
My hypothesis is that: If the electrolyte source is changed (potato, apple, lime, lemon), then the production of energy (measured in volts) using a lemon will produce the highest voltage because the acid content in the fruit or vegetable will produce electricity when in contact with the electrodes (both zinc and copper
Explanation:
Do grasshoppers have wings
Answer: yes
Explanation: I feed grasshoppers to frogs
How many valence electrons does nitrogen atom have
Answer:
5 valence electrons
Explanation:
Answer:
5 electrons
Explanation:
Because atomic number of Nitrogen is 7 total 7 electrons are present 2 in first shell and 5 in valence shell
So these 5 electrons are known as valence electrons
List the Basic Skill And Experiments
Answer:
Observing. This is the most basic skill in science. ...
Communicating. It is important to be able to share our experiences. ...
Classifying. After making observations it is important to notice similarities, differences, and group objects according to a purpose. ...
Inferring. ...
Measuring. ...
Predicting.Explanation:
hope this he;lp
pick me a the brainliest
An unknown gas with a formula of HX is contained in a 25.0 L tank at 1.2 atm and 25.0 oC. What is the chemical formula of the gas if the mass of the gas is 44.7 g?
Answer:
HCl
Explanation:
Volume = 25L
Temperature = 25.0 oC + 273 = 298 K (Converting to kelvin units)
Pressure = 1.2 atm
Mass of gas = 44.7g
Formular of gas = HX
To solve this, we have to know the identity of X. One qay to do that is by obtaining the molecular mass of the compound.
To get the molar mass, we need the number of mole.
Using the ideal gas equation;
PV = nRT
where R = gas constant = 0.082 057 L atm K−1 mol−1
n = PV / RT
n = 1.2 * 25 / 0.082 057 * 298
n = 30 / 24.45
n = 1.227 mol
The relationship between number of moles and molar mass is given as;
Nummber f moles = mass / molar mass
Molar mass = mass / Number of moles
Molar mass = 44.7 / 1.227
Molar mass = 36.43 g/mol
Molar mass of gas X = Molar mass of H + Molar mass of X
36.43 = 1 + X
X = 36.43 - 1 = 35.43
Chlorine is the only element with molar mass approximate to 35.43
Hence X = Cl
The chemical formular = HCl
A student jumps of a sled toward the west after it stops at the bottom of an icy hill. Based on the law of action-reaction, in what direction will the sled most likely move as the student jumps off
Answer:
East
Explanation:
Given Newton's third law of motion; "Action and reaction are equal and opposite", when a student jumps off a sled toward the west after it stops at the bottom of an icy hill, the sled will move in the East direction.
This is because, the force exerted on the sled is a reaction force and is opposite in direction to the force that thrusts the boy westward though equal in magnitude with the former.
5. Aluminum sulfide reacts with water to form aluminum hydroxide and hydrogen sulfide. (a) Write a
balanced equation for this reaction. (b) How many grams of aluminum hydroxide can be obtained from
5.50 g of aluminum sulfide?
6.2
A1₂S3 + 6H₂O → 3H₂S + 2A1 (OH)3
53
a) A1₂S₃ + 6H₂O → 3H₂S + 2Al(OH)₃ +3H₂S
b) 5.72grams of aluminum hydroxide.
It demonstrates that each molecule of aluminum sulfide yields two molecules of aluminum hydroxide, or two molecules of Al(OH)3 for every molecule of aluminum sulfide.
Al(OH)3 has a molecular weight of 78 while Al2S3 has a molecular weight of 150. Starting with 5.5 grams of aluminum sulfide, we can set up the ratio by dividing it by 150 to get x/156.
5.5/ 150 = x/156
where x represents the quantity of Al(OH)3 that was created.
Since two moles of Al(OH)3 are created for every mole of Al2S3 that reacts, we utilize 156, which is twice as much as 78. As a result, we arrive at x = (5.5)(156)/150 = 5.72 gm. To the nearest decigram, we obtain 5.72grams of aluminum hydroxide.
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explain how to convert the moles to litters and litters to moles
Consider the reaction between NO(g) and 02(8) represented
below. What is the balanced equation for this reaction, and what is the
limiting reactant?
when nitric oxide reacts with oxygen GIVES Nitrogen dioxide.
NO(g)+ [tex]0_2[/tex]=2N[tex]O_2[/tex] is the balanced reaction
here, from the above reaction, we have found that
1 mole of NO and 2 mole of [tex]0_2[/tex] gives 2 mole of N[tex]O_2[/tex]
from the mole concentration, we can conclude that oxygen is limiting reactant.
A limiting reactant is an active ingredient in a reaction that is totally consumed by its conclusion. The limiting reactant determines how much product is produced in a chemical process.
In a chemical reaction, the reactants react in a stoichiometric sequence to produce the products. The limiting reactant is the one that is present in lower stoichiometric amounts. The amount of the product created depends on how much of the limiting reactant is used up in the reaction. Excess reactants are the additional reactants in the reaction besides the limiting reactants.
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51. The radius of gold is 144 pm and the density is 19.32 g/cm3. Does elemental gold have a face-centered cubic structure or a body-centered cubic structure
Answer:
Elemental gold to have a Face-centered cubic structure.
Explanation:
From the information given:
Radius of gold = 144 pm
Its density = 19.32 g/cm³
Assuming the structure is a face-centered cubic structure, we can determine the density of the crystal by using the following:
[tex]a = \sqrt{8} r[/tex]
[tex]a = \sqrt{8} \times 144 pm[/tex]
a = 407 pm
In a unit cell, Volume (V) = a³
V = (407 pm)³
V = 6.74 × 10⁷ pm³
V = 6.74 × 10⁻²³ cm³
Recall that:
Net no. of an atom in an FCC unit cell = 4
Thus;
[tex]density = \dfrac{mass}{volume}[/tex]
[tex]density = \dfrac{ 4 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{6.74 \times 10^{-23} \ cm^3}[/tex]
density d = 19.41 g/cm³
Similarly; For a body-centered cubic structure
[tex]r = \dfrac{\sqrt{3}}{4}a[/tex]
where;
r = 144
[tex]144 = \dfrac{\sqrt{3}}{4}a[/tex]
[tex]a = \dfrac{144 \times 4}{\sqrt{3}}[/tex]
a = 332.56 pm
In a unit cell, Volume V = a³
V = (332.56 pm)³
V = 3.68 × 10⁷ pm³
V 3.68 × 10⁻²³ cm³
Recall that:
Net no. of atoms in BCC cell = 2
∴
[tex]density = \dfrac{mass}{volume}[/tex]
[tex]density = \dfrac{ 2 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{3.68 \times 10^{-23} \ cm^3}[/tex]
density =17.78 g/cm³
From the two calculate densities, we will realize that the density in the face-centered cubic structure is closer to the given density.
This makes the elemental gold to have a Face-centered cubic structure.
who was the modern astronomer who provided insight into inertia through careful experiments
The modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
Who was Galileo Galilei?Galileo Galilei was one of the most important astronomers in history who showed through careful experimentation that the Earth orbit around the Sun, which is known as heliocentrism.
In conclusion, the modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
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The frequency of a radio wave was measured to be (3.1x10^8) Hz What is the energy of the radio wave in kilojoules (kJ)?
1 Hz = 1 s–1
h = 6.626 x 10-34 J.s
MAKE SURE YOU PAY ATTENTION TO THE UNIT OF ENERGY GIVEN
The frequency of a radio wave was measured to be ( 3.1 x [tex]10^8[/tex] ) Hz . The energy of the radio wave in kilojoules ( kJ ) is 20.5 x [tex]10^{-29}[/tex] kJ .
The radio waves are the types of the electromagnetic radiation .
Calculation ,
given frequency of radio wave ( v ) = 3.1 x [tex]10^8[/tex] Hz
plank's constant ( h ) = 6.626 x [tex]10^{-34}[/tex] J.s ( given )
Formula used : E = hv
where h = plank's constant
v = frequency of radio wave
Now putting the value of all in equation ( i ) we get ,
E = 6.626 x [tex]10^{-34}[/tex] × 3.1 x [tex]10^8[/tex]
E = 20.5 x [tex]10^{-29}[/tex] kJ
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Please help me I need these answers
Answer:
Q8) True
Q9) First ionization energy
Q10) Metal oxides
Explanation:
A common property of group one elements (alkali metals) is their combination with water to form basic solutions. E.g 2K(s)+2H2O(l)→2KOH(aq)+H2(g).
The distance of the outermost electron in the atom from the nucleus is inversely related to the first ionization energy. As the distance between the outermost electron and the nucleus in group 17 elements gets larger, the corresponding first ionization energies of elements in the group gets smaller.
Group 1 elements can combine with oxygen to give metal oxides. E.g 4K + O2 --> 2 K2O
hot dog hot dog hot diggity dog we got ears its time for cheers so long for now ah mickey mouse........ hot dog hot dog hot diggity dog
Answer:
b
Explanation:
Answer:
hot dog
Explanation:
How many atoms in Be element
Answer:
4
Explanation:
The Atomic number of beryllium is 4, which means that it has 4 protons.
What are the developing reactions that allow the identification of Ni2+ and Cu²+?
Dimethylglyoxime is reacted with nickel ion solution. If it gives red precipitate then nickel ions are confirmed to be present.
Sodium hydroxide solution is been added to Copper Sulphate first in little and then in excess. A pale blue soluble precipitate is formed. This confirms presence of Cu²+.
CuSO4 + 2NaOH → Na2SO4 + Cu(OH)2
what is the difference between bio chemistry and organic chemistry
Answer:
Organic chemistry is the chemistry of carbon based compounds while biochemistry is the study of directly biologically relevant chemistry..pls mark as brainliestWhat’s two options are examples of chemical changes
Answer:
what are the options? I'll edit my answer to the correct one once you inform me lol
When this event occurs and blankets animals with poisonous gasses it is called a ___________________ cloud.
Fill in the blank! :)
Answer:
pollution cloud. im not really sure but hope this helps
Explanation:
Why do we need to be curious?
in your own sentence
Answer:
Well, there are a few reasons to be curious..
Being curious can: Keep your mind active instead of passive.
Keeps your mind observant on new ideas.
It also opens up new possibilities and keeps you creative.
You can have more excitement and mysteries in life!
Explanation:
Answer: I think you need to be curious because that is how we explore things. Many people find things interesting and if you don't inspect basically you will never learn to question right or wrong things.
Explanation:
GIVEING BRAINLIST
ATP is a(1 point)
storable form of energy.
usable form of energy.
form of energy that can be used and stored.
form of energy that can be stored and released as heat.
Answer:
ATP is a stored form of energy
Explanation:
it is the main source of this
A model shows that the moon has grown to twice its size, yet it has remained in the same place. In one to two sentences, explain how this would impact the gravity between Earth and the moon.(2 points)
pls help
It would make the planet's tilt harder to change, which would mean a more stable climate, which “just means maybe ice ages wouldn't happen as often,” he told me.
What is climate?The average weather throughout a region's long term, usually 30 years, is called the climate. More precisely, it is the mean and variability of meteorological variables over a period of time that can range from a few months to many millions of years. Temperature, humidity, air pressure, wind speed, and precipitation are a few of the meteorological parameters that are frequently observed.
Climate, in a larger sense, refers to the interactions between the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere as well as their status as parts of the climate system. Latitude/longitude, topography, altitude, land use, and the presence of surrounding water bodies and their currents all have an impact on a place's climate.
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Balance the following SYNTHESIS chemical reaction with the correct coefficients:
___Al (s) + ___S (s) --> ___Al2S3 (s)
a
1, 2, 3
b
2, 3, 1
c
1, 1, 2
d
3, 2, 1
Answer:
b 2,3,1
Explanation:
2 Al + 3 S ----> Al2S3
Which best describes how magnesium (Mg) and oxygen (O) bond?
a
They form an ionic bond by exchanging two electrons.
b
They form an ionic bond by exchanging three electrons.
c
They form a covalent bond by sharing one electron.
d
They form a covalent bond by sharing four electrons.
Answer:
a
They form an ionic bond by exchanging two electrons.
Explanation:
Magnesium loses two electrons and oxygen gains these electrons so ionic bond is formed
The statement that best describes how magnesium (Mg) and oxygen (O) bond is, "they form an ionic bond by exchanging two electrons." This is further explained below.
What is bonding?Generally, bonding is the process of firmly connecting items together using adhesive, heat, pressure, or chemical bonding.
In conclusion, When magnesium (Mg) and oxygen (O) bond, they form an ionic bond by exchanging two electrons
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Every neutral atom of a given element has the same number of what two subatomic particles?
A. Protons and neutrons
B. Protons and electrons
Answer:
B. Protons and Electrons
Explanation:
Protons have a positive charge and electrons have a negative charge. When an element contains the same number of both of those particles the charges will cancel out leaving the atom with a neutral charge, as neutrons already have a neutral charge.
pls help me this is hard aaaaa
The mass of the aluminum sample is 52 g.
Mass of the aluminum
The mass of the aluminum is determined by applying the principle of conservation of energy as shown below.
heat lost by aluminum = heat gained by water
m₁c₁Δθ₁ = m₂c₂Δθ₂
where;
m₁ is mass of aluminumm₂ is mass of waterc₁ is specific heat capacity of aluminumc₂ is specific heat capacity of water = 4.186 J/g⁰CΔθ₁ is change in temperature of aluminumΔθ₂ is change in temperature of waterm₁(0.897)(93.2 - 17.8) = (300)(4.186)(17.8 - 15)
m₁(0.897)(75.4) = (300)(4.186)(2.8)
67.634m₁ = 3516.24
m₁ = 3516.24/67.634
m₁ = 52 g
Thus, the mass of the aluminum sample is 52 g.
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HELP HELP !!
All stimuli must be sent to ur brain for a response to occur
true or false?